I've never had a problem with grasshoppers, but earwigs are a constant pest come this time of year (they especially eat the leaves and flower buds on our hydrangeas).

We have just started spraying them with our own insecticidal soap recipe (1 cup dish soap water + 1 cup cooking oil for concentrate, then 2 tsp concentrate per cup of water for spray, shake as you spray, and shake concentrate, as the oil will separate), which worked well most of last summer. When it failed (it was sometime in August), we sprayed with malathion and never saw the earwigs again.

Best of luck!